There is a stranger outside, I have been___________(注意他) for a while.keeping an

游客2023-07-24 34

问题 There is a stranger outside, I have been___________(注意他) for a while.

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答案 keeping an eye on him

解析本题着重考查keep an eye on的用法，意思是“密切注视”；另外，句中采用的是现在完成进行时， keep应为分词形式。

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